Hi @pplu444, welcome to the community!
The answers to your questions will depend on what kind of scene you are rendering. For many scenes, network speed and CPU will matter as much or more than the graphics card. Where the GPU is the bottleneck, memory bandwidth will be important.
Scenes that are often more GPU-dependent include things like:
- Voxel rendering, especially with larger datasets.
- Heavy post-processing workflows like Ambient Occlusion.
- Point clouds
At 4K-resolution, relatively lighter scenes like photogrammetry will also be GPU-intensive. But network and CPU speeds will still be critical.
To see where your scene’s bottlenecks are, you could look at the recommendations in our Performance Testing Guide. The tests described there will give you an idea of how much time is spent on network requests and CPU processing.